The family of Matthew Cryer from Killamarsh, who died on holiday in Zante, are meeting with MPs and the Europe Minister in London.
17 year old Matthew died at the foot of steep stairs outside a bar in Greece in 2008. His family have been running a campaign to get justice for his death.
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The man entered the Yousaf Newsagent, in Fraser Street, Burmantofts, and demanded cash on Sunday at around 5.30pm.
The pony, which is thought to be two to three years old, was discovered off Scawby Road in Broughton Vale on Saturday at around 6pm.
ISG says it is pulling out because of the increasing costs and delays caused by a legal challenge